Uninstalling Apps

I'm also new with the Macs. I have been uninstalling apps by dragging them into appzapper and it works okay. But I've been reading in this forum about programs/apps having their own uninstaller. Where do you look for or find the uninstaller first to see if a program has one? In windows I knew where to look,but never gave it a thought on how to do it with a Mac. Thanks for a reply.

Thanks for the reply, so I guess just dragging the app to appzapper removes all if not most traces of the program. But when a program has it's own uninstaller where would I look for it? If a program has it's own uninstaller I'd prefer to use it first. Thanks